Valve-spring-lifting mechanism



Feb- 9 Q I M. woop VALVE SPRING LIFTING MECHANISM Filed Nov. 15 1922 2Sheets-Sheet 1 a 2:2. \wl Fr:

.* kw- L J Patented tee. a 1926.

LOUIS M. wocn, or new mm, 1-I.Y., assienets r0 semen-o Iit L'rieLn VALVELIFTER ,A'l tlhill tltEFifiE.

conrona'rron, or nnw roan, n. Y., A oonroaarrolv or new YonK.

VALVE-SPRIhl'G-LIFTING MECHANISM.

Application filed November To all whom it may concern Be it known thatI, LOUlS M. 7001), a citizen of the United States, residing at IIQ'GWYork city, in the county of'New York and State of New .York, haveinvented certain new and useful Improvements in Valve- Spring-LiftingMechanism, of which the following is a specification.

This invention relates to valve spring lifting mechanism for internalcombustion engines, an objectlof the invention being to provide anin'iproved mechanism for elevating and maintaining under compression apluralitv of valve springs, which mechanism will be relatively simple inconstruction, relatively inexpensive to manufacture,

easy to opeate, and eiiicient and effective for the purposes for whichit is designed.

A further object of this invention is to provide mechanism for elevatingunder. compression the valve springs of the engine, the mechanism havingimproved means for compressing the valve springs by cam action,

thereby minimizing the power neeessary to operate the mechanism. v

A. further ob ect of this invention is to provide an improved. liftingbar for valve spring lifting mechanism, the bar being improved manner.

A further object of this invention is to provide lifting mechanism forvalve springs having improved means for maintaining the neclianism inelevated position with the valve springs held under compression.

A further object of this inventionis to provide an improved valve springlifting lever having one or more cam surfaces adapted to coact with alifting member for facilitating the operation thereof.

Other objects of this invention will appeia in the following descriptionthereof, reference being had to the accompanying drawings forming a partof this specification, wherein like reference characters;indicatecorrespondin parts in the several views and wherein Fig. 1 is a frontview in elevation illustrating'an en'ibodiment of my improved mechanismadapted for use with a four cylinder engine; Fig. 2 is a sectionalelevation guided with relation to the. springs in an 15, 1922. SerialNo. 601,090.

taken substantially on lines 2-.-'2 of Fig 1; 'r 1g. 3 s a fragmentarysectionalelevation illustrating the mechanism. 111 elevated position;Fig. i is a perspective view of the lifting member; Fig. 5 is afragmentary end view of the lifting member in elevated position; Fig. 6is a fragmentary detail view of a formiof lifting lever; Fig. 7 is adetail view partly in section of a modified form of lifting member; andis a detail sectional view taken through one end of the liftingmeniiber.

In the drawings .1 have illustrated a presplate being held in positionby a suitable stud 0r bolt 5(land nut 51. Thevalve spring chamber 9 islocated within a housing .or casing comprising a rear wall 10 andforwardly extending end walls 1.1, the latter adapted to form guidemeans for the valve spring lifter bar as hereinafter described. Thefront of the valve spring housing is also provided with the usualdepending hp or flan 'e 12 extendiin alon the to) ed e s b a b thereoiandan upwardly prtuectmg lip or flange 13 extending along thelower edgethereof. The cover plate is bolted against the outer faces of theflanges 12 and 13, and hereinafter shown the lower flange or lip 23 isutilized as a means for fulcruming the iftiug lever. The valves 14; areprovidcd with valve stems 15 which extend into the chamber 9, andadjacent to the lower ends of the valve stems are located retaining pins16 against which the valve spring retaining seats 17 impinge when innormal position, the seats '17 being constructed to receive the ends ofthe valve springs 18 which areheld between the upper wall of the chamber9 and the seats 17. The lower wall of the chamber 9 isprovided with theusual guide members 19 through which the valve lifters 2O extend,v thelatter being operated by suitable cams on the camshaft of the engine,

The lifting member for the present mecha- 21 and forming a partthereof.v At suitable" intervals the member 23 is provided with recesses24 adapted to freely embrace the valve stems 15 and permit the seatingof the retainers 17 on the uppersurfaces of the mem.

her 23. The latter is also provided with re cesses 25 for permitting thelifting bar to clear the guide sleeves 19.

Intermediatethe ends of the bar 21, the

latter is "preferably enlarged at 26 and a verticalguide slot 27 isformed therein. The.

rear of the lifting bar 21 is also enlarged and reinforced at 28 throughwhich extends a vertical guide slot 29 registering with the guide slot27 and a horizontal guide slot 30 also registering therewith. Adjacentto theopposite ends of the lifting bar a pair of slots 31 are provided,and within each slot is pivoted at 34 a locking or supporting member orleg -35 having at the lower endthereof a notch or detent 35. Itwill benoted that the upper edge 36 of each locking member 35 e: :te nds at apredeten I mined angle so that when the member or supportingleg 35 isswung outwardlv as shown in Fig. 8, the inclined edge 32 of the slot 31will form a stop against which the edge 36 impinges. The lower inclinededge 33 of the slot 31 also forms a stop for limiting the rearwardswinging of the member 35. p

-The supporting latches or legs are automatically swung into variouspositions by means of springs 37 pivoted to the bar 21 as by means ofscrews 33. The springs 37 may be provided at the free'ends thereof withsuitable thumb pier-cs3!) engaging notched or recessed edges 39 formed:in the mean bers 35, so that upon swinging the springs 37 so that thethumb pieces 39 will engage theupper part of the recesses the memberswill be swung outwardly by the action of the springs, and upon shiftingthe springs sothat the thumb pieces will be located at the lower part ofthe recesses 39, the members will be swung inwardly by the action of thesprings. Thus the springs will swing the members either outwardlyorinwardly depending uponwh ether the ends 39 engage the members 35above or below the pivots 34. v

The lifting bar 21 is operated by means of a lever 40, which in thepresent instance is provided with fork or bifurcated ends 41 having the.upper. edges 42 thereof curved or inclined to form cam surfaces. Theexand the pins 16 replaced.

As illustrated inFig. 7 the bar '21 may be provided with a springretainer engaging portion 44' suitably recessed at 46 so as to freelyembrace the valve stems 15. These re .cesses are countersunk to providecounterrecesses terminating invalve spring retainer seats 45, whicharepreferablv curved or shaped so as to correspond to the shape ofthespring retainers 17 and into which the retainers are seated. .Theseats 45, it will therefore be seen, form guides for receiving andcentering the retainers 1'7, and therefore assist in guiding the liftingbar 21 with re lation to the valve springs 18.

. 1n the operation of the present improved liftingmechanism the nut 51on the outer end of the stud or bolt 50 is removed for the purpose ofremoving the cover plate and lifting bar 21 placed in position with thebolt 50 extending through the guide slots 27 and 29. :The nut 51 is thenscrewed onto the end of the bolt.50, the portions 23 or 44ofthe-liftingbar 21 extending under the valve spring retainer seats 17and against which the latter are seated. The thumb pieces 39 of thesprings 37 are then shifted to the lower portions of the guide recesses39 and the lever 40 placed in position as illustrated in Fig. 2-. Uponswinging the handle of lever 40 upwardly, the curved or inclined camsurfaces 42 willengage the rounded cam surface 43 at the under side ofthe bar 21, thereby lifting or elevating the bar 21 and lifting thesprings 18 simultaneously under compression. During this operation the:am surfaces 42 will be shifted over and relatively to the cam surface43 and the construction of these surfaces re duces considerably theamount of power necessary to lift and. compress the valve springs. Alsoduring this operation the springs 37 urge the locking members 35 againstthe lip or flange 13, and when the notches 35 register with the upperedge of the lip 13 the springs will swing the members 35 inwardly tothe, position illustrated in Figs. 8 and 5, the members 35 thus lockingand supporting the bar 21 in, elevated position. The lever 40 may. thenbe removed and the operator may readily remove the re taining pins 16and the valves 14. .After the grinding operation the valves arereinserted 'lhereupon the lever 40 is again placed in position and thethumb pieces39ofsprings 37 shifted to the upper'ends of the guiderecesses 39 so that upon lifting the bar 21 slightly by means of thelever the springs 37 will swing the locking members 85 outwardly withthe notches 35 free of the lip or flange 13. The expansion of i thevalve springs will then lower the bar at and reseat the valve springseats 17 on the retaining pins 16.

It will be 'notedthat the guide portions 22, at the ends of the liftingbar 21, engage the housing in front of the valve springs and are guidedthereby in a vertical plane, thus preventing the lifting bar fromshifting inwardly during the operation of the lifting lever. Furthermorethe guide slots 27, 29, and 30 embrace the bolt or stud 50, and withoutexerting any substantial pressure ti1ereagainst enable the lifting barto be centered with relation to the retaining seats 17 and also guidethe lifting bar againstendwise' movement during operation. Furthermorethe seats d5, as shown in'Fig. 7, are adapted to form guides forreceiving the valve spring seats 17 and for permitting the lifting bar21. to be guided with relation to the springs 18, and valve stems 15.

It will be understood that by describing in detail herein any particularform, structure or arrangement it is not intended to limit the inventionbeyond the terms of the several claims or the requirements of the priorart.

I claim as my invention:

l. Ina valve spring lifter, the combination of a lifting bar havingmeans for operating against a plurality of valve springs, and anoperating member supported for operation by the engine beneath saidlifting bar, said bar having a curved cam portion and said member havinga cam shiftable into engagen'ient with said cam portion for elevatingsaid lifting bar.

2. in a valve spring lifter, the combination of a lifting memberadaptedto extend beneath a plurality of valve springs, and meanssupported for operation by the engine beneath said lifting member forelevating said member and comprising a detachable operating n'ieirdier,said lifting member and means having enacting curved cam surfaces.

3. In a valve spring lifter, the combination of a lifting member, meansfor operating said lifting member against the valve springs andcomprising a plurality of cams operating against said lifting member,and an operating handle for said cams.

i. In a valve spring lifter, the combination of a lifting memberhavingmeans operative beneath the valve I springs for lifting'the same,means for operating said member and con'iprising a pair of spaced camshaving lifting engagement with said member, and'a single operating meansfor controlling said cams.

5. In a valve spring lifting mechanism, the combination of a liftingmember comprising beyond the end of said vertical a vertical portion anda horizontal portion operable against the valve springs, said memberhaving acurved cam surface, and means supported for operation by theengine and engaging said cam surface for lifting .the member. yy r 6,.Valve spring lifting mechanism eomprising an angle bar having horizontaland verticalportions, said vertical portion having a guide portionprojecting longitudinally 7 portion and also below the same. i

7. In a valve spring lifter the combination of a lifting bar havingmeans for operating against a plurality of valve springs, and meanssupported for operation by the engine beneath said lifting bar forelevating the same, said means comprising a curved cam fulcrumedindependently of said bar and shiftable transversely thereof forelevating the same;

8. A lifting bar for valve spring mechanism having a plurality of guideportions of greater width than the bar, one of said por-i tions having avertical guide slot and one thereof having shiftable locking meansextending thereinto.

9. A'lifting bar for valve spring lifting mechanism having a pair oftransversely extending guide slots for receiving a housing belt of theengine.

10. A lifting bar for valve spring lifting mechanism having intermediatethe ends thereof an enlarged portion provided with transverse guideslots adapted to receive the housingbolt of an engine. y 11; In alifting member for valve spring lifting mechanism, an angle barcomprising a vertically disposed portion having a vertical guide slotfor embracing a stud or bolt.

12. A. lifting member for valve spring lifting mechanism comprising anangle bar formed from a pair of transversely extending members, onetl'iereof having recesses for embracing a plurality of valve stems, saidmembers llaving con'mim'iicating guide slots.

13. In a valve spring litter the combination of a lifting bar havingmeans for opei'- ating against a plurality of valve springs,

means for elevating said bar, swinging loo-k ing means for maintainingthe bar in elevated position, and means for limiting. the swingingmovement thereof.

Ll. In a valve spring lifter, the combination of a lifting memberoperative against a plurality of valve springs, means for lifting thesame, a shiftable locking support for said member, and resilient meansshiftably engaging said support for shifting the same.

15. In a valve spring lifting mechanism, a lifting member, a swingingsupport pivoted thereto, and means adapted toengage said support atopposite sides of the pivot for swinging the same. i Y

16. In a valve spring lifting mechanism,

the combination of a lifting member comprising a vertical portion and ahorizontal portion extending beneath aplurality of valve springs, anoperating member sup- 5 ported for operation by the engine; and a camcontrolled by said operating member and shiftable in-toposition forelevating said liftingmember. I 7

17. In 21 valve spring lifter the combina- 10 tion of an angle barcomprising a vertical portion and ahorizontal portion, one thereofhaving a curved cam portion, and cam means supported for operation bythe engine for operating said angle bar and comprising a detaehableoperating member and a cum controlled thereby and engageable with saidcurved cam portion.

Signed at New York city, N. Y., this 4th day of November, 1922.

V LOUIS M. lVOOD.

